About Short Iron Butterfly
The Short Iron Butterfly strategy is a 4-legged option spread that combines a short straddle and a long strangle.
The Short Iron fly could also be viewed as a combination of a credit bull put spread and a short bear call spread.
The strike differential is equidistant in that the long put and long call of the strangle are identically spaced from the straddle and all options have the same expiration.
Max profit is observed if the underlying ‘pins’ the straddle (body) at expiration. Max loss is incurred If the underlying is trading outside of the lower put and upside call (wings).
Default Fields and Descriptions
- Net credit (max profit) – The premium received, which is the straddle sale price less the purchase of the strangle.
- Max Risk – Max risk is the strike differential subtracted from the Net credit.
- Lower (-) Break Even – The strike price of the lower put subtracted from the Net Debit
- Upper (+) Break Even – The strike price of the upper call added to the Net Debit
- Break Even Probability – The probability of the underlying expiring inside of the two BE levels at expiration.
- In the Money (ITM) Probability – The probability of the underlying expiring inside of the upper and lower strikes (straddle)
- Out of the Money (OTM) Probability – The probability of the underlying expiring outside the upper and lower strikes (straddle)
- Risk Reward – The ratio of the maximum spread price at the expiration to the credit received
The screener results are initially sorted by descending "Probability."
Options information is delayed a minimum of 15 minutes, and is updated at least once every 15-minutes through-out the day. The screener displays probability calculations based on the delayed stock price at the time the strategy is updated. The new day's options data will start populating the screener at approximately 8:55a CT. Strikes that have not traded today are excluded from the results.
Main features of the Screener include:
- Ability to add various filters, with hundreds of different combinations.
- Save a Screener: When you've defined filters that you want to use again, save the screener.
- Load a Saved Screener: Select a previously saved set of Screener filters to view today's results.
- View the Results using Flipcharts: Page through charts of the underlying ymbols on the results page.
- Download the Results: Download up to 1000 results to a .csv file. The Download will also pull all of the data fields present on the View you use.
- Automatic Screener Emails: This option is available for Barchart Premier Members. When you save a screener, you can opt to receive the top 10, 25, or 50 results via email along with an optional .csv file of the top 1000 results. Emails can be sent at Market Open (9:00am CT), Mid-Day (12:00pm CT), End-of-Day (4:45pm CT), and Overnight (3:00am CT) Monday through Friday.
Note: When selecting the Filter View for your Screener email, a filter must identify a specific search value in order for it to be included in the email.
Filters
Barchart Premier subscribers can add or modify different filters on the screener to find calls on the most favorable stock options.
Reordering Filters
Once filters are added, you may drag and drop them in the SET FILTERS tab to reorder the way they appear on the RESULTS tab (when using the Filters View). Each filter you add has the "Order" icon which is used to reposition it.
Deleting Filters
To remove a filter from your screener, click the checkbox to the left of the filter name, then click the red "Delete" button at the top of the column. You may also select all filters for deletion by clicking the checkbox at the top of the column, which selects ALL filters for deletion. You will be asked to confirm your decision to delete.
So you can focus on the best options, the screener starts by setting certain options:
- Days to Expiration (monthly expirations only) is 60 days or less
- Security Type is only Stocks
- The Options Volume for Leg1, Leg2, Leg 3, Leg 4: for US market, must be greater than or equal to 100. For Canadian market, must be greater than or equal to 1.
- Open Interest for Leg1, Leg2, Leg 3, Leg 4: for US market, must be greater than or equal to 500. For Canadian market, must be greater than or equal to 5.
- Ask Price for Leg 2 and Leg 3 is greater than 0.05
- Bid Price for Leg 1 and Leg 4 is greater than 0.05
- Max Profit must be greater than $0.00
In addition, the option must not be a "restricted" option (the option cannot be based on a split stock).
Note: Non-standard or "restricted" options (options quotes marked with an asterisk * after the strike price, and found on an individual symbol's options page) are automatically removed from the screener. A "restricted option" is typically created after spin-offs or mergers, and is not tradeable.
Probability Calculation
We take the underlying stock price (l), the target price (b), days to expiration (t) and the implied volatility (v) to calculate probability:
Probability Above = 1-NORMSDIST (LN(b / l) / (v*SQRT (t / 365)))
Probability Below = NORMSDIST (LN (b / l) / (v*SQRT(t / 365)))
b = target price
l = underlying last price
v = implied volatility
t = days to expiration
Short Put Butterfly Break Even: Probability of the underlying trading outside of the break even points at expiration.
Short Put Butterfly Max Profit: Probability of the underlying expiring below the lower put strike or above the highest put strike.
Views
The Results page contains three standard views. You may switch the view using the links at the top of the screener results table. The Main View shows the Volume and Open Interest for each option, while the Dividend & Earnings View can be used to highlight strategies with upcoming dividends and earnings. The Filter view shows you the data contained in the field(s) you've added to the screener.
A checkbox is provided on all Views to "Show Strategy Description" in the view. The Strategy Description can be helpful in breaking down how the options strategy was built. Example of a Short Put Butterfly description:
SPB_11/18/22_92.00_3.00
where:
- SPB = strategy
- 11/18/22 = expiration date
- 92.00 = Leg 1 strike
- 3.00 = Strike Differential (difference between each leg: Leg1, Leg2 and Leg3)
Main View
- Symbol - the underlying equity. Clicking on the symbol will take you to the current quote page.
- Price~ - the delayed stock price at the time the strategy is updated for the underlying equity.
- Exp Date - the expiration date of the option
- Leg 1 Strike - the price at which the underlying security can be bought if the option is exercised.
- Leg 1 Ask - ask price of the Leg 1 option
- Leg 2 Strike - the price at which the underlying security can be bought if the option is exercised.
- Leg 2 Bid - bid price of the Leg 2 option
- Leg 3 Strike - the price at which the underlying security can be bought if the option is exercised.
- Leg 3 Bid - bid price of the Leg 3 option
- Leg 4 Strike - the price at which the underlying security can be bought if the option is exercised.
- Leg 4 Ask - ask price of the Leg 4 option
- +BE - the upper limit necessary for the strategy to break even (Leg1 Strike plus Net credit/debit)
- -BE - the lower limit necessary for the strategy to break even (Leg2 Strike minus Net credit/debit)
- Max Profit - Max profit is the credit received
- Max Loss - Max loss equals the difference between strikes minus the credit received. Max loss takes place if the options expire at the center strike.
- Risk / Reward% - (spread differential - net credit) / net credit
- Probability - the probability the last price will be at or beyond the break even point at expiration.
Dividend & Earnings View
- Dividend - the dividend the equity pays on the Ex-Dividend Date. On the morning of the Dividend Ex-Date, the stock's price is lowered by the amount of the dividend that was just paid.
- Dividend Ex-Date - the first day on which the stock trades without the dividend. If you wish to receive the dividend, you must own the stock by the close of market on the day before the Dividend Ex-Date. Many times, a covered call is exercised early so the buyer can own the stock and collect the dividend. This typically happens to ITM options the day before the Dividend Ex-Date.
- Earnings Date - The date on which a company is expected to release their next earnings report. The prices are more volatile, which tends to inflate the prices of the near-the-money strikes. During a contract period when there is an earnings report due, the earnings announcement can dramatically shift the range in which the stock has been trading.
